I'm creating a Windows Phone 7 app which allow to listen a web radio. But I also want to get the cover of the song and I want it to be refreshed every 3 minutes for example.
When I start debugging my app, I've no problem but I've no idea how to call back my code to refresh the cover.
Thanks a lot.
Aymeric.
I found a solution not really the one I looked for but my mates used a timer to refresh the same application for Android and iOS since there is no push notification from the server.
So I used this code
DispatcherTimer refreshTimer = new DispatcherTimer();
refreshTimer.Interval = TimeSpan.FromSeconds(30);
refreshTimer.Tick += new EventHandler(refreshTimer_Tick);
refreshTimer.Start();
Thank you all for the time you spent on this question.
Aymeric.
Related
I have a SignalR hub and two clients (Windows and PCL for Android and iOS). Neither of the clients is able to call some methods on the server. This behaviour is quite odd, since the methods look very similar. Moreover, a colleague of mine is able to call methods I cannot call, and vice versa, does not invoke methods that I invoke with no problems.
Here is an example of a method, which works for me and does not work for my colleague:
public override async Task<bool> RefreshArray(User user, int waitMilis)
{
var cts = new CancellationTokenSource();
try
{
cts.CancelAfter(waitMilis);
await Proxy.Invoke("RefreshArray", user);
return true;
}
catch (Exception ex)
{
OnExceptionOccured(ex);
return false;
}
}
And a method which does not work for me, but works for my colleague:
public override async Task<bool> RequestInformation(User user, Product product, int waitMilis)
{
var cts = new CancellationTokenSource();
try
{
cts.CancelAfter(waitMilis);
await Proxy.Invoke("RequestInformation", user, product);
return true;
}
catch (Exception ex)
{
OnExceptionOccured(ex);
return false;
}
}
Yes, me and my colleague have exactly the same code. And no, there are no typos or different arguments. I have tried to get as much data from the client connection as possible, by setting _connection.TraceLevel = TraceLevels.All; However, I did not get any information on the invoked methods, just on the replies from the hub. When calling RefreshArray, I got exactly the data I requested. When calling RequestInformation, the debugger never even hit the breakpoint in the hub method and the _connection.Trace displayed only this: 11:22:45.6169660 - 7bc57897-489b-49a2-8459-3fcdb8fcf974 - SSE: OnMessage(Data: {})
Has anybody solved a similar issue? Is there a solution?
UPDATE 1
I just realized that I have encountered almost the same issue about a year ago (Possible SignalR bug in Xamarin Android). StackOverflow has also pointed me to a question with almost the same issue (SignalR on Xamarin.iOS - randomly not able to call Hub method), just related to iOS and Azure. However, I got the same proble even outside Xamarin, on Windows Phone 8.1 and and Windows 10 Universal App. Moreover, I am running the server just locally, so it is not an issue od Azure. Is it really possible, that a 2 years old bug has no solution?
UPDATE 2
I have just created a simple console application with SignalR.Client. In the console application every method worked just fine. Amazingly, also the Windows 10 Universal Application started to behave as expected - every hub method was invoked correctly. Windows Phone 8.1 also improved its behaviour (all hub methods invoked). However, every now and then the connection tried to reconnect periodically (for no apparent reason), leading to Connection started reconnecting before invocation result was received. error. The Android application still behaved as before.
So I tried to replicate my previous steps and created another console application, but this time with SignalR.Client.Portable library. To my dissapointment, there was no change in the Android application behaviour.
Next week we will start to test our application on iOS, so I really wonder what new oddities will we encounter.
I have managed to solve the problem (at least so it seems). As it turned out, there is some weird stuff going around, when an application receives an answer from SignalR hub. It seems as if the HubProxy was blocked for a certain period of time on Android, while it drops the connection and starts to reconnect periodically on Windows Phone, not waiting for an asnwer from the hub.
The implementation of RefreshArray on the hub was something like this:
public async Task RefreshArray(User user)
{
await Clients.Caller.SendArray(_globalArray);
await Clients.Caller.SendMoreInformation(_additionalInfo);
}
Because the method sent two methods as an answer, the client Proxy got stuck and each platform handled it in its own unexpected way. The reason why some methods were called on my computer and not on colleagues was, simply, because we had different position of breakpoints, which enabled the application to resolve at least some requests and responses.
The ultimate solution was to add some synchronization into the invokation of methods. Now my hub calls only await Clients.Caller.SendArray(_globalArray);. This is then handled on the client with a ArraySent(string[] array) event, which then subsequently invokes the SendMoreInformation() method on the hub.
Is it possible to disable cache for the Webview control for a Windows Phone 8.1 runtime universal app? My App seems to be remembering the information it received the first time. My app logs me into a service and when I go back to rerun app in the emulator (without completing shutting down the emulator) it logs me in automatically rather than giving me the prompt. This behavior is in the NavigationCompleted handler if that helps explain a bit more on where I am hitting this issue.
If I were to shut off the emulator completely and then restart it then I am prompted for the login name and password again. I have gotten over this cache issue, when I was using the HttpClient in other part of my app, by sending the no-cache in the header as:
client.DefaultRequestHeaders.Add("Cache-Control", "no-cache");
Can I do something similar for the webview control?
Thank You!
here is the code which I used to clear the cookies which resolved my issue:
Windows.Web.Http.Filters.HttpBaseProtocolFilter myFilter = new Windows.Web.Http.Filters.HttpBaseProtocolFilter();
var cookieManager = myFilter.CookieManager;
HttpCookieCollection myCookieJar = cookieManager.GetCookies(new Uri("target URI for WebView"));
foreach (HttpCookie cookie in myCookieJar)
{
cookieManager.DeleteCookie(cookie);
}
There is no way to do it programmatically.
But for the test purposes for Windows application you can do it manually - http://blogs.msdn.com/b/wsdevsol/archive/2012/10/18/nine-things-you-need-to-know-about-webview.aspx#AN7.
Besides polling, how can I tell when a long-running Amazon EC2 operation is complete? For example, using the CreateImage API function can take upwards of several minutes.
Right now I'm doing this:
// MAKE THE API CALL
var createRequest = new CreateImageRequest().WithInstanceId("i-123456").WithName("MyNewAMI");
var createResponse = myAmazonEC2Client.CreateImage(createRequest);
var imageId = createResponse.CreateImageResult.ImageId;
// ICKY POLLING CODE
bool isImaging = true;
while (isImaging)
{
var describeRequest = new DescribeImagesRequest().WithImageId(imageId);
var describeResponse = myAmazonEC2Client.DescribeImages(describeRequest);
isImaging = describeResponse.DescribeImagesResult.Image.Single().ImageState == "pending";
Thread.Sleep(10000); // sleep for 10 seconds
}
// CreateImage IS COMPLETE; MOVE ON WITH OUR WORK
I hate this. After calling CreateImage, I'd like to just get notified somehow that it's all done and move on. Is this possible? I'm using the AWS .NET SDK in this example, but I'm not looking specifically for a C# solution.
UPDATE: Cross-posted to the AWS Forums
Some events in amazon can be configured to send notifications to an SNS Topic. For example when using auto scaling you can have notifications when a server is launched and terminated. As far as I know there is no way to trigger these notifications for other services such as CreateImage. I've looked for this type of feature in the past with no luck. I was trying to do it to create a script that would launch servers in a specific order. I wound up just polling their API as I couldn't find any way to register to those events.
James Hunter Ross answered this question over on the AWS Forums as follows:
Polling is it. That said, since you have a C# program started, why not let it spawn a polling process that notifies you as you wish? It seems you are almost done, in some respects.
(Of course, it would be nice if such functionality was built-in at AWS.)
I wasn't able to find a StackOverflow profile for him, but if he shows up I'll edit this to give him credit.
I have a reminder notification which passes a parameter to my app like this
Reminder closeReminder = new Reminder(somevalue);
closeReminder.BeginTime = testtime;
closeReminder.Content = "Tap here!";
closeReminder.RecurrenceType = RecurrenceInterval.None;
closeReminder.NavigationUri = new Uri("/MainPage.xaml?para=paraone", UriKind.RelativeOrAbsolute);
closeReminder.Title = "Title here";
My problem is, If the application is already opened and reminder pop-up, when i tap on the notification nothing happens. It does not call OnNavigatedTo in the MainPage.xaml.cs even. If the application is not focused, no issues. How can I fix this issue?
It's not an issue, it's by design. From Peter Torr's post:
Note that if your app is currently in the foreground when the reminder
is fired, tapping on the title / content will dismiss the reminder but
will not cause a navigation (since your app is already running).
Like KeyboardP states this is by design. Reminders are a way of getting a user to your application at a certain time, there's no point in doing that when they are already in. Your are expected to take care of this yourself since your app should be aware of the reason the reminder is fired anyway.
I am making a call to a REST web service and the mobile app is retrieving the results from its cache and not going to the server.
I have seen other suggested fixes (similar issue and similar issue2) but the Cache property is not available in silverlight 4.
Does anyone have an idea of how to force silverlight 4 on windows phone 7 to make a request and not hit the cache?
Although not ideal, a easy solution is to send something like the field "junk" with the value DateTime.Now. That way, a value is always brand new, and will never get cached. If you were doing this in a standard querysting for example:
"&junk=" + DateTime.Now;
I've hit this problem too on overflow 7 talking to StackApps - the only thing I could think of was to add an addition random variable to the end of the HTTP/REST request.
The most proposed solution is the same as William Melani's.
But it is not ideal and some services reject requests with unknown parameters or any parameter. In this case it is cleaner and more reliable to use the IfModifiedSince header as follows:
WebClient wc = new WebClient();
wc.Headers[HttpRequestHeader.IfModifiedSince] = DateTime.UtcNow.ToString();
wc.DownloadStringCompleted += wc_DownloadStringCompleted;
wc.DownloadStringAsync(new Uri(bitstampUrl));
WebClient wc = new WebClient();
wc.Headers[HttpRequestHeader.IfModifiedSince] = DateTime.UtcNow.ToString();
worked for me